src/com/owncloud/android/ui/preview/PreviewImageFragment.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012-2014 ownCloud Inc.
   3  *
   4  *   This program is free software: you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License version 2,
   6  *   as published by the Free Software Foundation.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  *
  13  *   You should have received a copy of the GNU General Public License
  14  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  */
  17 package com.owncloud.android.ui.preview;
  18
  19 import java.io.BufferedInputStream;
  20 import java.io.File;
  21 import java.io.FileInputStream;
  22 import java.io.FilterInputStream;
  23 import java.io.IOException;
  24 import java.io.InputStream;
  25 import java.lang.ref.WeakReference;
  26
  27 import android.accounts.Account;
  28 import android.annotation.SuppressLint;
  29 import android.app.Activity;
  30 import android.graphics.Bitmap;
  31 import android.graphics.BitmapFactory;
  32 import android.graphics.BitmapFactory.Options;
  33 import android.graphics.Matrix;
  34 import android.graphics.Point;
  35 import android.media.ExifInterface;
  36 import android.os.AsyncTask;
  37 import android.os.Bundle;
  38 import android.support.v4.app.FragmentStatePagerAdapter;
  39 import android.view.Display;
  40 import android.view.LayoutInflater;
  41 import android.view.View;
  42 import android.view.View.OnClickListener;
  43 import android.view.ViewGroup;
  44 import android.widget.ImageView;
  45 import android.widget.ProgressBar;
  46 import android.widget.TextView;
  47
  48 import com.actionbarsherlock.view.Menu;
  49 import com.actionbarsherlock.view.MenuInflater;
  50 import com.actionbarsherlock.view.MenuItem;
  51 import com.owncloud.android.R;
  52 import com.owncloud.android.datamodel.OCFile;
  53 import com.owncloud.android.datamodel.ThumbnailsCacheManager;
  54 import com.owncloud.android.datamodel.ThumbnailsCacheManager.ThumbnailGenerationTask;
  55 import com.owncloud.android.files.FileMenuFilter;
  56 import com.owncloud.android.lib.common.utils.Log_OC;
  57 import com.owncloud.android.ui.dialog.ConfirmationDialogFragment;
  58 import com.owncloud.android.ui.dialog.RemoveFileDialogFragment;
  59 import com.owncloud.android.ui.fragment.FileFragment;
  60 import com.owncloud.android.utils.BitmapUtils;
  61 import com.owncloud.android.utils.TouchImageViewCustom;
  62
  63
  64
  65 /**
  66  * This fragment shows a preview of a downloaded image.
  67  *
  68  * Trying to get an instance with NULL {@link OCFile} or ownCloud {@link Account} values will produce an {@link IllegalStateException}.
  69  *
  70  * If the {@link OCFile} passed is not downloaded, an {@link IllegalStateException} is generated on instantiation too.
  71  *
  72  * @author David A. Velasco
  73  */
  74 public class PreviewImageFragment extends FileFragment {
  75
  76     public static final String EXTRA_FILE = "FILE";
  77     public static final String EXTRA_ACCOUNT = "ACCOUNT";
  78
  79     private View mView;
  80     private Account mAccount;
  81     private TouchImageViewCustom mImageView;
  82     private TextView mMessageView;
  83     private ProgressBar mProgressWheel;
  84
  85     public Bitmap mBitmap = null;
  86
  87     private static final String TAG = PreviewImageFragment.class.getSimpleName();
  88
  89     private boolean mIgnoreFirstSavedState;
  90
  91
  92     /**
  93      * Creates a fragment to preview an image.
  94      *
  95      * When 'imageFile' or 'ocAccount' are null
  96      *
  97      * @param imageFile                 An {@link OCFile} to preview as an image in the fragment
  98      * @param ocAccount                 An ownCloud account; needed to start downloads
  99      * @param ignoreFirstSavedState     Flag to work around an unexpected behaviour of {@link FragmentStatePagerAdapter}; TODO better solution
 100      */
 101     public PreviewImageFragment(OCFile fileToDetail, Account ocAccount, boolean ignoreFirstSavedState) {
 102         super(fileToDetail);
 103         mAccount = ocAccount;
 104         mIgnoreFirstSavedState = ignoreFirstSavedState;
 105     }
 106
 107
 108     /**
 109      *  Creates an empty fragment for image previews.
 110      *
 111      *  MUST BE KEPT: the system uses it when tries to reinstantiate a fragment automatically (for instance, when the device is turned a aside).
 112      *
 113      *  DO NOT CALL IT: an {@link OCFile} and {@link Account} must be provided for a successful construction
 114      */
 115     public PreviewImageFragment() {
 116         super();
 117         mAccount = null;
 118         mIgnoreFirstSavedState = false;
 119     }
 120
 121
 122     /**
 123      * {@inheritDoc}
 124      */
 125     @Override
 126     public void onCreate(Bundle savedInstanceState) {
 127         super.onCreate(savedInstanceState);
 128         setHasOptionsMenu(true);
 129     }
 130
 131
 132     /**
 133      * {@inheritDoc}
 134      */
 135     @Override
 136     public View onCreateView(LayoutInflater inflater, ViewGroup container,
 137             Bundle savedInstanceState) {
 138         super.onCreateView(inflater, container, savedInstanceState);
 139         mView = inflater.inflate(R.layout.preview_image_fragment, container, false);
 140         mImageView = (TouchImageViewCustom) mView.findViewById(R.id.image);
 141         mImageView.setVisibility(View.GONE);
 142         mImageView.setOnClickListener(new OnClickListener() {
 143             @Override
 144             public void onClick(View v) {
 145                 ((PreviewImageActivity) getActivity()).toggleFullScreen();
 146             }
 147
 148         });
 149         mMessageView = (TextView)mView.findViewById(R.id.message);
 150         mMessageView.setVisibility(View.GONE);
 151         mProgressWheel = (ProgressBar)mView.findViewById(R.id.progressWheel);
 152         mProgressWheel.setVisibility(View.VISIBLE);
 153         return mView;
 154     }
 155
 156     /**
 157      * {@inheritDoc}
 158      */
 159     @Override
 160     public void onActivityCreated(Bundle savedInstanceState) {
 161         super.onActivityCreated(savedInstanceState);
 162         if (savedInstanceState != null) {
 163             if (!mIgnoreFirstSavedState) {
 164                 OCFile file = (OCFile)savedInstanceState.getParcelable(PreviewImageFragment.EXTRA_FILE);
 165                 setFile(file);
 166                 mAccount = savedInstanceState.getParcelable(PreviewImageFragment.EXTRA_ACCOUNT);
 167             } else {
 168                 mIgnoreFirstSavedState = false;
 169             }
 170         }
 171         if (getFile() == null) {
 172             throw new IllegalStateException("Instanced with a NULL OCFile");
 173         }
 174         if (mAccount == null) {
 175             throw new IllegalStateException("Instanced with a NULL ownCloud Account");
 176         }
 177         if (!getFile().isDown()) {
 178             throw new IllegalStateException("There is no local file to preview");
 179         }
 180     }
 181
 182
 183     /**
 184      * {@inheritDoc}
 185      */
 186     @Override
 187     public void onSaveInstanceState(Bundle outState) {
 188         super.onSaveInstanceState(outState);
 189         outState.putParcelable(PreviewImageFragment.EXTRA_FILE, getFile());
 190         outState.putParcelable(PreviewImageFragment.EXTRA_ACCOUNT, mAccount);
 191     }
 192
 193
 194     @Override
 195     public void onStart() {
 196         super.onStart();
 197         if (getFile() != null) {
 198            BitmapLoader bl = new BitmapLoader(mImageView, mMessageView, mProgressWheel);
 199            bl.execute(new String[]{getFile().getStoragePath()});
 200         }
 201     }
 202
 203
 204     /**
 205      * {@inheritDoc}
 206      */
 207     @Override
 208     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 209         super.onCreateOptionsMenu(menu, inflater);
 210         inflater.inflate(R.menu.file_actions_menu, menu);
 211     }
 212
 213     /**
 214      * {@inheritDoc}
 215      */
 216     @Override
 217     public void onPrepareOptionsMenu(Menu menu) {
 218         super.onPrepareOptionsMenu(menu);
 219
 220         if (mContainerActivity.getStorageManager() != null) {
 221             // Update the file
 222             setFile(mContainerActivity.getStorageManager().getFileById(getFile().getFileId()));
 223
 224             FileMenuFilter mf = new FileMenuFilter(
 225                 getFile(),
 226                 mContainerActivity.getStorageManager().getAccount(),
 227                 mContainerActivity,
 228                 getSherlockActivity()
 229             );
 230             mf.filter(menu);
 231         }
 232
 233         // additional restriction for this fragment
 234         // TODO allow renaming in PreviewImageFragment
 235         MenuItem item = menu.findItem(R.id.action_rename_file);
 236         if (item != null) {
 237             item.setVisible(false);
 238             item.setEnabled(false);
 239         }
 240
 241         // additional restriction for this fragment
 242         // TODO allow refresh file in PreviewImageFragment
 243         item = menu.findItem(R.id.action_sync_file);
 244         if (item != null) {
 245             item.setVisible(false);
 246             item.setEnabled(false);
 247         }
 248
 249         // additional restriction for this fragment
 250         item = menu.findItem(R.id.action_move);
 251         if (item != null) {
 252             item.setVisible(false);
 253             item.setEnabled(false);
 254         }
 255
 256     }
 257
 258
 259
 260     /**
 261      * {@inheritDoc}
 262      */
 263     @Override
 264     public boolean onOptionsItemSelected(MenuItem item) {
 265         switch (item.getItemId()) {
 266             case R.id.action_share_file: {
 267                 mContainerActivity.getFileOperationsHelper().shareFileWithLink(getFile());
 268                 return true;
 269             }
 270             case R.id.action_unshare_file: {
 271                 mContainerActivity.getFileOperationsHelper().unshareFileWithLink(getFile());
 272                 return true;
 273             }
 274             case R.id.action_open_file_with: {
 275                 openFile();
 276                 return true;
 277             }
 278             case R.id.action_remove_file: {
 279                 RemoveFileDialogFragment dialog = RemoveFileDialogFragment.newInstance(getFile());
 280                 dialog.show(getFragmentManager(), ConfirmationDialogFragment.FTAG_CONFIRMATION);
 281                 return true;
 282             }
 283             case R.id.action_see_details: {
 284                 seeDetails();
 285                 return true;
 286             }
 287             case R.id.action_send_file: {
 288                 mContainerActivity.getFileOperationsHelper().sendDownloadedFile(getFile());
 289                 return true;
 290             }
 291             case R.id.action_sync_file: {
 292                 mContainerActivity.getFileOperationsHelper().syncFile(getFile());
 293                 return true;
 294             }
 295
 296             default:
 297                 return false;
 298         }
 299     }
 300
 301
 302     private void seeDetails() {
 303         mContainerActivity.showDetails(getFile());
 304     }
 305
 306
 307     @Override
 308     public void onResume() {
 309         super.onResume();
 310     }
 311
 312
 313     @Override
 314     public void onPause() {
 315         super.onPause();
 316     }
 317
 318     @Override
 319     public void onDestroy() {
 320         if (mBitmap != null) {
 321             mBitmap.recycle();
 322             System.gc();
 323         }
 324         super.onDestroy();
 325     }
 326
 327
 328     /**
 329      * Opens the previewed image with an external application.
 330      */
 331     private void openFile() {
 332         mContainerActivity.getFileOperationsHelper().openFile(getFile());
 333         finish();
 334     }
 335
 336
 337     private class BitmapLoader extends AsyncTask<String, Void, Bitmap> {
 338
 339         /**
 340          * Weak reference to the target {@link ImageView} where the bitmap will be loaded into.
 341          *
 342          * Using a weak reference will avoid memory leaks if the target ImageView is retired from memory before the load finishes.
 343          */
 344         private final WeakReference<ImageViewCustom> mImageViewRef;
 345
 346         /**
 347          * Weak reference to the target {@link TextView} where error messages will be written.
 348          *
 349          * Using a weak reference will avoid memory leaks if the target ImageView is retired from memory before the load finishes.
 350          */
 351         private final WeakReference<TextView> mMessageViewRef;
 352
 353
 354         /**
 355          * Weak reference to the target {@link Progressbar} shown while the load is in progress.
 356          *
 357          * Using a weak reference will avoid memory leaks if the target ImageView is retired from memory before the load finishes.
 358          */
 359         private final WeakReference<ProgressBar> mProgressWheelRef;
 360
 361
 362         /**
 363          * Error message to show when a load fails
 364          */
 365         private int mErrorMessageId;
 366
 367
 368         /**
 369          * Constructor.
 370          *
 371          * @param imageView     Target {@link ImageView} where the bitmap will be loaded into.
 372          */
 373         public BitmapLoader(ImageViewCustom imageView, TextView messageView, ProgressBar progressWheel) {
 374             mImageViewRef = new WeakReference<ImageViewCustom>(imageView);
 375             mMessageViewRef = new WeakReference<TextView>(messageView);
 376             mProgressWheelRef = new WeakReference<ProgressBar>(progressWheel);
 377         }
 378
 379
 380         @Override
 381         protected Bitmap doInBackground(String... params) {
 382             Bitmap result = null;
 383             if (params.length != 1) return result;
 384             String storagePath = params[0];
 385             try {
 386
 387                 File picture = new File(storagePath);
 388
 389                 if (picture != null) {
 390                     //Decode file into a bitmap in real size for being able to make zoom on the image
 391                     result = BitmapFactory.decodeStream(new FlushedInputStream
 392                             (new BufferedInputStream(new FileInputStream(picture))));
 393                 }
 394
 395                 if (result == null) {
 396                     mErrorMessageId = R.string.preview_image_error_unknown_format;
 397                     Log_OC.e(TAG, "File could not be loaded as a bitmap: " + storagePath);
 398                 }
 399
 400             } catch (OutOfMemoryError e) {
 401                 Log_OC.e(TAG, "Out of memory occured for file " + storagePath, e);
 402
 403                 // If out of memory error when loading image, try to load it scaled
 404                 result = loadScaledImage(storagePath);
 405
 406                 if (result == null) {
 407                     mErrorMessageId = R.string.preview_image_error_unknown_format;
 408                     Log_OC.e(TAG, "File could not be loaded as a bitmap: " + storagePath);
 409                 }
 410
 411             } catch (NoSuchFieldError e) {
 412                 mErrorMessageId = R.string.common_error_unknown;
 413                 Log_OC.e(TAG, "Error from access to unexisting field despite protection; file " + storagePath, e);
 414
 415             } catch (Throwable t) {
 416                 mErrorMessageId = R.string.common_error_unknown;
 417                 Log_OC.e(TAG, "Unexpected error loading " + getFile().getStoragePath(), t);
 418
 419             }
 420
 421             // Rotate image, obeying exif tag
 422             result = BitmapUtils.rotateImage(result, storagePath);
 423
 424
 425             return result;
 426         }
 427
 428         @Override
 429         protected void onPostExecute(Bitmap result) {
 430             hideProgressWheel();
 431             if (result != null) {
 432                 showLoadedImage(result);
 433             } else {
 434                 showErrorMessage();
 435             }
 436         }
 437
 438         @SuppressLint("InlinedApi")
 439         private void showLoadedImage(Bitmap result) {
 440             if (mImageViewRef != null) {
 441                 final ImageViewCustom imageView = mImageViewRef.get();
 442                 if (imageView != null) {
 443                     imageView.setBitmap(result);
 444                     imageView.setImageBitmap(result);
 445                     imageView.setVisibility(View.VISIBLE);
 446                     mBitmap  = result;
 447                 } // else , silently finish, the fragment was destroyed
 448             }
 449             if (mMessageViewRef != null) {
 450                 final TextView messageView = mMessageViewRef.get();
 451                 if (messageView != null) {
 452                     messageView.setVisibility(View.GONE);
 453                 } // else , silently finish, the fragment was destroyed
 454             }
 455         }
 456
 457         private void showErrorMessage() {
 458             if (mImageViewRef != null) {
 459                 final ImageView imageView = mImageViewRef.get();
 460                 if (imageView != null) {
 461                     // shows the default error icon
 462                     imageView.setVisibility(View.VISIBLE);
 463                 } // else , silently finish, the fragment was destroyed
 464             }
 465             if (mMessageViewRef != null) {
 466                 final TextView messageView = mMessageViewRef.get();
 467                 if (messageView != null) {
 468                     messageView.setText(mErrorMessageId);
 469                     messageView.setVisibility(View.VISIBLE);
 470                 } // else , silently finish, the fragment was destroyed
 471             }
 472         }
 473
 474         private void hideProgressWheel() {
 475             if (mProgressWheelRef != null) {
 476                 final ProgressBar progressWheel = mProgressWheelRef.get();
 477                 if (progressWheel != null) {
 478                     progressWheel.setVisibility(View.GONE);
 479                 }
 480             }
 481         }
 482
 483     }
 484
 485     /**
 486      * Helper method to test if an {@link OCFile} can be passed to a {@link PreviewImageFragment} to be previewed.
 487      *
 488      * @param file      File to test if can be previewed.
 489      * @return          'True' if the file can be handled by the fragment.
 490      */
 491     public static boolean canBePreviewed(OCFile file) {
 492         return (file != null && file.isImage());
 493     }
 494
 495
 496     /**
 497      * Finishes the preview
 498      */
 499     private void finish() {
 500         Activity container = getActivity();
 501         container.finish();
 502     }
 503
 504     public TouchImageViewCustom getImageView() {
 505         return mImageView;
 506     }
 507
 508     static class FlushedInputStream extends FilterInputStream {
 509         public FlushedInputStream(InputStream inputStream) {
 510         super(inputStream);
 511         }
 512
 513         @Override
 514         public long skip(long n) throws IOException {
 515             long totalBytesSkipped = 0L;
 516             while (totalBytesSkipped < n) {
 517                 long bytesSkipped = in.skip(n - totalBytesSkipped);
 518                 if (bytesSkipped == 0L) {
 519                       int byteValue = read();
 520                       if (byteValue < 0) {
 521                           break;  // we reached EOF
 522                       } else {
 523                           bytesSkipped = 1; // we read one byte
 524                       }
 525                }
 526                totalBytesSkipped += bytesSkipped;
 527             }
 528             return totalBytesSkipped;
 529         }
 530     }
 531
 532     /**
 533      * Load image scaled
 534      * @param storagePath: path of the image
 535      * @return Bitmap
 536      */
 537     @SuppressWarnings("deprecation")
 538     private Bitmap loadScaledImage(String storagePath) {
 539
 540         Log_OC.d(TAG, "Loading image scaled");
 541
 542         // set desired options that will affect the size of the bitmap
 543         BitmapFactory.Options options = new Options();
 544         options.inScaled = true;
 545         options.inPurgeable = true;
 546         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD_MR1) {
 547             options.inPreferQualityOverSpeed = false;
 548         }
 549         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) {
 550             options.inMutable = false;
 551         }
 552         // make a false load of the bitmap - just to be able to read outWidth, outHeight and outMimeType
 553         options.inJustDecodeBounds = true;
 554         BitmapFactory.decodeFile(storagePath, options);
 555
 556         int width = options.outWidth;
 557         int height = options.outHeight;
 558         int scale = 1;
 559
 560         Display display = getActivity().getWindowManager().getDefaultDisplay();
 561         Point size = new Point();
 562         int screenWidth;
 563         int screenHeight;
 564         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB_MR2) {
 565             display.getSize(size);
 566             screenWidth = size.x;
 567             screenHeight = size.y;
 568         } else {
 569             screenWidth = display.getWidth();
 570             screenHeight = display.getHeight();
 571         }
 572
 573         if (width > screenWidth) {
 574             // second try to scale down the image , this time depending upon the screen size
 575             scale = (int) Math.floor((float)width / screenWidth);
 576         }
 577         if (height > screenHeight) {
 578             scale = Math.max(scale, (int) Math.floor((float)height / screenHeight));
 579         }
 580         options.inSampleSize = scale;
 581
 582         // really load the bitmap
 583         options.inJustDecodeBounds = false; // the next decodeFile call will be real
 584         return BitmapFactory.decodeFile(storagePath, options);
 585
 586     }
 587 }